183990 has 16 divisors (see below), whose sum is σ = 441648. Its totient is φ = 49056.

The previous prime is 183979. The next prime is 184003. The reversal of 183990 is 99381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 6133 = 183990 / (1 + 8 + 3 + 9 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3037 + ... + 3096.

It is an arithmetic number, because the mean of its divisors is an integer number (27603).

2¹⁸³⁹⁹⁰ is an apocalyptic number.

183990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

183990 is an abundant number, since it is smaller than the sum of its proper divisors (257658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

183990 is a wasteful number, since it uses less digits than its factorization.

183990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 183990 is about 428.9405553221. The cubic root of 183990 is about 56.8763091918.

The spelling of 183990 in words is "one hundred eighty-three thousand, nine hundred ninety".